The series 'Secret Journey' follows the tragic and sexually charged downfall of Miki, a beautiful and devoted wife. Her idyllic life shatters when she discovers her husband has been embezzling money from his company. To save him from ruin, Miki is forced into a sordiente agreement with his sinister boss, Takigawa. The journey begins with her being blackmailed into a single act of sexual submission, but it quickly spirals into a continuous cycle of degradation and forced promiscuity. Takigawa relentlessly exploits her, filming their forced encounters and using the tapes to further his control. Each episode chronicles her descent as she is passed around to various business partners and depraved individuals, forced to perform increasingly debaucherous acts. Her body becomes a commodity, used in brutal group encounters, public humiliations, and a variety of kinks designed to break her spirit. The series explicitly details these encounters, showing Miki's transformation from a proud wife into a broken, yet compliant, sex slave who eventually finds a twisted sense of purpose in her submission.